build: add -Wstrict-prototypes to the compiler arguments

examples/dp_renderer.h

@@ -82,7 +82,7 @@ typedef struct rdr_info
     // Cookie passed to the renderer implementation callbacks
     void *cookie;
     // Callback to create the renderer
-    void* (*create_renderer)();
+    void* (*create_renderer)(void);
     // Callback to destroy the renderer
     void (*destroy_renderer)(void *cookie);
     // Callback to the render function that renders a prevously sent frame

examples/dp_renderer_sdl.c

@@ -43,7 +43,7 @@ typedef struct renderer_priv_ctx
     SDL_Texture *tex;
 } Dav1dPlayRendererPrivateContext;
 
-static void *sdl_renderer_create()
+static void *sdl_renderer_create(void)
 {
     SDL_Window *win = dp_create_sdl_window(0);
     if (win == NULL)

meson.build

@@ -247,6 +247,7 @@ if cc.get_argument_syntax() != 'msvc'
       '-Wno-maybe-uninitialized',
       '-Wno-missing-field-initializers',
       '-Wno-unused-parameter',
+      '-Wstrict-prototypes',
       '-Werror=missing-prototypes',
       '-Wshorten-64-to-32',
     ]

tests/header_test.c

@@ -27,7 +27,7 @@
 
 #include DAV1D_TEST_HEADER
 
-int main()
+int main(void)
 {
     return 0;
 }